Re: Topband: 160 vert

[Bryon Paul Veal NØAH]

Why not go with 133 feet?

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From: Topband  on behalf of gary mankoff 

Sent: Monday, September 3, 2018 11:52:44 AM
To: topband@contesting.com
Subject: Topband: 160 vert

I am planning on a full size vertical made of gray pvc tubing with about 3 
lenghts of 125feet of 10 ga wire inside the pvc .this will be inserted in the 
branches of a tall tree .also going to use a FCP .I hope this works
Gary
N6biz
73

Sent from my iPad
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Re: Topband: Capacitive vs. Inductive Matching of Inverted 'L'/'T'

[Clive GM3POI]

Tom the name comes from the inductance used on Yagi's as a Hairpin match
simply because it looks like one. When used on a vertical it simply goes
from the bottom of the insulated conductor to ground.   Are you using a PI-
L network in the PA for a start. I would worry about harmonic content as a
separate issue to the best way to configure  the L or T. Again a simple coax
stub could fix the problem.
73 Clive GM3POI 

-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom
Boucher
Sent: 03 September 2018 18:16
To: 160 reflector
Subject: Topband: Capacitive vs. Inductive Matching of Inverted 'L'/'T'

I used to use a slightly shortened 'L' with a small inductor at the base
until I was told by LA5HE that he could hear me on 80 as well as 160!
Using capacitor matching forms a low pass network which will reduce harmonic
radiation. The inductor method forms a high pass L-network.

BTW, why is it called a 'hairpin' inductor? Looks nothing like a hairpin, or
does it?

73,
Tom G3OLB
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Re: Topband: Air wound coil

[Joe Subich, W4TV]

Getting to six would result in a smaller top hat but may not be worth
the mechanical hassle.

If the mast has traditional three way guying, the mechanical hassle for
a six wire top hat may not be that much greater than a four wire top
hat.

If the top hat wires slope downward, keeping them to the minimum length
will result in maximum efficiency (and minimum "shielding" of the top
of the vertical element).

73,

   ... Joe, W4TV


On 2018-09-03 7:20 AM, Paul Christensen wrote:

I ran the same model in 4Nec2 as below but changed the hat from the traditional 
two wires to four, spaced 90 degs.  Complex base Z is near 16+j0.  Even though 
two symmetrical top-hat wires produce little radiation, four wires result in 
wires that are only 24 ft long to achieve resonance -- versus 41 ft with only 
two wires.  Getting to six would result in a smaller top hat but may not be 
worth the mechanical hassle.


"4Nec2 shows that with a 68 ft. thin radiator, resonance can be achieved with wires 
roughly 41 ft. per side.  With a ground field of 60 radials, 90 ft long on sandy ground, 
4Nec2 reports a base impedance of 15.4+j2.5."


Paul, W9AC




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Topband: Capacitive vs. Inductive Matching of Inverted 'L'/'T'

[Tom Boucher]

I used to use a slightly shortened 'L' with a small inductor at the base
until I was told by LA5HE that he could hear me on 80 as well as 160!
Using capacitor matching forms a low pass network which will reduce
harmonic radiation. The inductor method forms a high pass L-network.

BTW, why is it called a 'hairpin' inductor? Looks nothing like a hairpin,
or does it?

73,
Tom G3OLB
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Topband: 160 vert

[gary mankoff]

I am planning on a full size vertical made of gray pvc tubing with about 3 
lenghts of 125feet of 10 ga wire inside the pvc .this will be inserted in the 
branches of a tall tree .also going to use a FCP .I hope this works 
Gary 
N6biz
73

Sent from my iPad
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Re: Topband: Leaving

[JL PFIRMAN]

To Nick,Cecil and all top banders
 I think think this is my first post.I remember a ham,Tom W8JI that used to 
be here also
73 Jim W3TO
> On September 3, 2018 at 12:54 AM Cecil Acuff  wrote:
> 
> 
> Well Nick,
> 
> I’m not sure who has told you that but if they were any kind of men they 
> would stand up and be held accountable for their opinions and actions that 
> cause good people, that are the future of this hobby, to be dissuaded from 
> participation.
> 
> Shame on you folks...and he’s rightyou don’t own this sandbox. You are 
> just given permission to play in it just like the rest of us.  Misbehave and 
> you have worn out your welcome and running folks off is misbehaving.
> 
> Before you go jumping to “Millennial” conclusions...I’ll be 62 in a couple of 
> weeks and have been licensed since High School so that won’t wash...
> 
> You need to do some serious soul searching about your opinions and if you 
> have decided you are too old to change then you shouldn’t be too old to know 
> when you should keep it to yourself.
> 
> Enough said...
> 
> Best of luck Nick...I hope you can find a place of joy in Ham Radio.
> 
> Cecil
> K5DL
> 
> Sent using recycled electrons.
> 
> > On Sep 2, 2018, at 10:09 PM, Nick Maslon - K1NZ  wrote:
> > 
> > Hi all,
> > 
> > While I have enjoyed many of the technical topics of the list, I have
> > become rather annoyed by the blame that has repeatedly come across the
> > reflector. From the FT8 arguments in addition to the "millennials causing
> > the WWV shutdown" argument, it appears that the parts of the hobby that I
> > enjoy do not cross paths with those on the topband reflector. Although I
> > wish you all many CW DX, it appears that I am no longer welcome and that I
> > must take my leave. I just wish that you guys would realize that your
> > sandbox is everyone's sandbox and that there is room for everyone in the
> > hobby and not just the "good ole boys" who have been around for 40+ years.
> > 73 from a 27 year old ham,
> > DE K1NZ
> > _
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Re: Topband: Air wound coil

[Paul Christensen]

I ran the same model in 4Nec2 as below but changed the hat from the traditional 
two wires to four, spaced 90 degs.  Complex base Z is near 16+j0.  Even though 
two symmetrical top-hat wires produce little radiation, four wires result in 
wires that are only 24 ft long to achieve resonance -- versus 41 ft with only 
two wires.  Getting to six would result in a smaller top hat but may not be 
worth the mechanical hassle.

>"4Nec2 shows that with a 68 ft. thin radiator, resonance can be achieved with 
>wires roughly 41 ft. per side.  With a ground field of 60 radials, 90 ft long 
>on sandy ground, 4Nec2 reports a base impedance of 15.4+j2.5."  

Paul, W9AC

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